And to expand on Carlos's comment,
I had to place a small ceramic bowl in my aquarium that is set level with the substrate
and feed the fish at the other end of the tank and then feed a sinking pellet food for the frogs.
right over the dish so the frogs can easily find the food.

I have had 7 ADF's in a community tank of 17 neon tetras 3 green cory's 3 Otto's 3 Cherry barbs.
for the last 4 years and all is well.